US5242542AExpiredUtility

Solution and method for removing zinc from the surface of a galvanized metal

16
Assignee: MASSE ALAINPriority: Aug 17, 1992Filed: Aug 17, 1992Granted: Sep 7, 1993
Est. expiryAug 17, 2012(expired)· nominal 20-yr term from priority
Inventors:Alain MasseDonald Murray
C23F 1/44
16
PatentIndex Score
1
Cited by
48
References
21
Claims

Abstract

The invention relates to a solution for removing zinc on the surface of a galvanized metal part, said solution comprising: phosphoric acid; alcohol of formula R--OH where R is an alkyl radical having from 1 to 6 carbon atoms; hydroquinone; and water. The invention also relates to a method for removing zinc on the surface of a galvanized metal part, said method comprising the steps of: preparing a solution containing phosphoric acid, alcohol of formula R--OH where R is an alkyl radical having from 1 to 6 carbon atoms, hydroquinone, and water; dipping said part in a bath of said solution; and removing said part from said bath and rinsing it.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A solution for removing zinc on the surface of a galvanized metal part, said solution comprising: phosphoric acid;   alcohol of formula R--OH where R is an alkyl radical having from 1 to 6 carbon atoms;   hydroquinone; and   water.   
     
     
       2. A solution according to claim 1, wherein the galvanized metal part is a galvanized steel part. 
     
     
       3. A solution according to claim 2, wherein said alcohol is isopropyl alcohol. 
     
     
       4. A solution according to claim 2, wherein said phosphoric acid is at a concentration varying from 15 to 30% (wt/vol). 
     
     
       5. A solution according to claim 3, wherein said phosphoric acid is at a concentration of approximately 20% (wt/vol). 
     
     
       6. A solution according to claim 2, wherein said hydroquinone is at a concentration of about 0.003M to 0.010M. 
     
     
       7. A solution according to claim 3, wherein said hydroquinone is at a concentration of about 0.003M to 0.010M. 
     
     
       8. A solution according to claim 7, wherein said hydroquinone is at a concentration about 0.007M. 
     
     
       9. A solution according to claim 2, wherein said alcohol is at a concentration of approximately 2.5% (vol/vol). 
     
     
       10. A solution according to claim 3, wherein said alcohol is at a concentration of approximately 2.5% (vol/vol). 
     
     
       11. A method for removing zinc on the surface of a galvanized metal part, said method comprising the steps of: preparing a solution containing phosphoric acid, alcohol of formula R--OH where R is an alkyl radical having from 1 to 6 carbon atoms, hydroquinone, and water;   dipping said part in a bath of said solution; and   removing said part from said bath and rinsing it.   
     
     
       12. A method according to claim 11, for removing zinc on the surface of galvanized steel part, said method comprising the steps of: preparing a solution containing phosphoric acid, alcohol of formula R--OH where R is an alkyl radical having from 1 to 6 carbon atoms, hydroquinone, and water;   dipping said part in a bath of said solution for at least 5 to 15 minutes at room temperature; and   removing said part from said bath and rinsing it with water.   
     
     
       13. A method according to claim 12, wherein said phosphoric acid concentration is varying from 15% to 30% (wt/vol). 
     
     
       14. A method according to claim 12, wherein said phosphoric acid concentration is approximately 20% (wt/vol). 
     
     
       15. A method according to claim 13, wherein said alcohol is isopropyl alcohol. 
     
     
       16. A method according to claim 14, wherein said alcohol is isopropyl alcohol. 
     
     
       17. A method according to claim 15, wherein said isopropyl alcohol is at a concentration of approximately 2.5% (vol/vol). 
     
     
       18. A method according to claim 16, wherein said isopropyl alcohol is at concentration of approximately 2.5% (vol/vol). 
     
     
       19. A method according to claim 12, wherein said hydroquinone is at a concentration of approximately 0.003M to 0.010M. 
     
     
       20. A method according to claim 18, wherein said hydroquinone is at a concentration of approximately 0.003M to 0.010M. 
     
     
       21. A method according to claim 19, wherein said hydroquinone is at a concentration of about 0.007M.

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